Master's Theses

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    Assessing real weather conditions impacts and urban area thermal performance via CFD modeling : a study on the formation and population dynamics of an urban area
    Adalı, Berk; Altan, Yiğit Can; Altan, Yiğit Can; Başol, Altuğ Melik; Ünal, Y.; Department of Civil Engineering
    This thesis aims to examine the problems that may arise in an urban area and minimize the adverse effects of extreme weather events such as heatwaves. To achieve this goal, different urban configurations with various geometries and material usage are modeled and analyzed in Yesilkoy/Istanbul using a commercial Computational Fluid Dynamics (CFD) program. The models are simulated with weather conditions (extreme and average) obtained from long-term meteorological records measured by the Turkish State Meteorological Service. The overall study encompasses four different case studies. The first case study focuses on creating a basic urban area with two parameters (albedo and aspect ratio). The second case study involves the effects of different weather conditions on the microclimate and a comparison of the numerical approach and TS 825 standards. The third case study examines the heat fluxes released from the urban area to the environment and aims to improve their performance. The fourth case study addresses the solution to excessive heating resulting from an increasing number of buildings and investigates the wind characteristics in canyons. As a result of the analysis, the highest average building surface temperature value difference between the low albedo and high albedo scenarios is calculated as 2.9 °C at 11 o'clock. With the effect of aspect ratio, the average temperature on the building surfaces decreased by at most 1 degree at 11 am. As a result of the roof design the average temperature difference on the building surfaces is at 1 pm and 2 pm, with a maximum of 0.6 °C. The cool roof strategy, which is used to reduce the negative effect of the population, showed the greatest effect at 1 pm and reduced the average temperature on the building surfaces by 1 °C.